The perspective of medical researchers or psychologists rarely takes into account factors related to ecological forces. The living, working and educational environments of these professionals is generally culturally urbanized. Because of this underestimated yet arguably significant factor, there is a tendency for health problems, such as obesity, psychoses, depression, or heart disease, to be interpreted as relating to societal (or congenital), rather than ecological circumstances.
One species of roundworm's only means of transmission from one host to the next is when one host is eaten by the next. The trichinella worm produces cysts or “nurse cells” embedded in the muscle fibre of the host, and when a predator eats those cysts, the worm is then released into the stomach of its next host.
It's therefore suspected by scientists that the trichinella worm may actually create health conditions in its host that leave it more vulnerable to attack by a predator, thus ensuring its own parasitic survival. These health conditions that create this kind of vulnerability may relate to both physical as well as psychological impairment. Since the trichinella worm sometimes migrates through the cerebrospinal fluid, it can cause hallucinations in its host. A host mentally disorientated in such a way is rendered much more vulnerable to attack by a predator. In a similar manner, predation would presumably play a key role in the transmission of many other parasitic diseases.
One can be sure that a rabbit that develops the chronic fatigue syndrome is the rabbit that will inevitably be caught by the fox. If a parasite, such as C. Pulmoni (or the 'Morgellons worm'), causes chronic fatigue, then the physical vulnerability it creates in its host may also be playing a key role in the transmission of the nematode down through the predatory food chain.
Nature is quite explicit and deliberate in its evolved designs: any animals in the wild that are either psychotic or chronically fatigued, without exception, share only one fate: They all get eaten.
If the toxic, hormone-secreting C. Pulmoni, in some cases, may cause periodic manifestations of psychosis or other aberrant behaviourial patterns in some individuals (via a chronic infection of the lumbar lymph nodes and potentially affecting the spine), then those hosts may also be socially alienated from the protection of the herd, isolated, and once again rendered much more vulnerable to attack by a predator.
The broader the range of potential reservoir hosts, the greater the capability for it to proliferate human populations. If for various technical or subjective reasons a species of nematode is not being identified in humans, then it would probably also be remaining undetected in animal hosts for the same reasons.
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